Anatase
a naturally occurring crystalline form of t-tanium dioxide, tio 2 .
historical examples
minute crystals of brookite have been detected with anatase and rutile in the iron-ore of cleveland in yorkshire.
encyclopaedia britannica, 11th edition, volume 4, part 3 various
there is no distinct cleavage (rutile and anatase have cleavages); hardness 5-6; sp.
encyclopaedia britannica, 11th edition, volume 4, part 3 various
t-tanic acid occurs in nature crystallized in anatase, arkansite, brookite, and rutile.
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noun
a rare blue or black mineral that consists of t-tanium oxide in tetragonal crystalline form and occurs in veins in igneous rocks. formula: tio2 also called octahedrite
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